FIELD: oil and gas industry.
SUBSTANCE: invention is referred to natural gas liquefaction method by continuous change in composition of at least one cooling mixture. At one cooling stage natural gas is cooled down by heat exchange with one cooling mixture circulating in a closed cooling loop. One part of natural gas flow is fed to separation system. Ambient temperature is also measured depending on time for detection ambient temperature increase or decrease, and when such temperature increase or decrease is detected then the following stages are performed whereat: one part of the cooling mixture is removed from the cooling loop; the removed part of the part of the cooling mixture is supplied to the separation system; in the separation system part of natural gas flow and the removed part of the part of the cooling mixture are separated with receipt of two components; one component received at the previous stage of separation is introduced into the cooling mixture for the purpose its composition change in order to change boiling temperature of the cooling mixture.
EFFECT: economical efficiency and more environmental friendliness of the method.
16 cl, 4 dwg
